package 单一职责原则;

/**
 * @ClassNameCourseImpl
 * @Description
 * @Author
 * @Date2021/11/15 14:10
 **/
public class CourseImpl implements CourseInfo,CourseManager {
    @Override
    public String getCourseTitle() {
        return null;
    }

    @Override
    public byte[] getReadPow() {
        return new byte[0];
    }

    @Override
    public void studyCourse() {

    }

    @Override
    public void refundCourse() {

    }
}
